J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (12): 2498-2506.DOI: 10.1016/j.jmst.2018.06.006

Special Issue: Corrosion in 2018 Nanomaterials 2018 Stainless Steel & High Strength Steel 2018

• Orginal Article • Previous Articles     Next Articles

Enhanced localized and uniform corrosion resistances of bulk nanocrystalline 304 stainless steel in high-concentration hydrochloric acid solutions at room temperature

S.G. Wang*(), M. Sun, Y.H. Xu, K. Long, Z.D. Zhang   

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
  • Received:2017-09-19 Revised:2017-12-25 Accepted:2018-04-08 Online:2018-12-20 Published:2018-11-15
  • Contact: Wang S.G.

Abstract:

The localized and uniform corrosion resistances of bulk nanocrystalline 304 stainless steel (NC-304SS) produced by severe rolling technique, and its conventional polycrystalline 304 stainless steel (CC-304SS) counterpart, were investigated in high-concentration hydrochloric acid solutions at room temperature. NC-304SS can scarcely suffer from localized corrosion in 4 mol/L and 5 mol/L HCl solutions during 5-day immersion tests, and in 1-3 mol/L HCl solutions during thirty-five-day immersion tests. The corrosion rate of NC-304SS was also less than that of CC-304SS during these immersion tests. The improved localized and uniform corrosion resistances of NC-304SS were explained in terms of the adsorption and chemical activity of Cl- on NC-304SS and CC-304SS characterized by X-ray photoelectron spectroscopy, and the valence electron configurations of NC-304SS and CC-304SS were characterized by ultra-violet photoelectron spectroscopy rather than conventional electrochemical results.

Key words: Stainless steels, Localized corrosion, Severe rolling technique, X-ray photoelectron spectroscopy, Ultra-violet photoelectron spectroscopy